Binder clips are those handly, spring-steel clips used to hold many pages of paper tightly together. They come in different sizes and for many years I have found them extremely useful as strong clamps.
I’ve seen scalpels recommended by ship modelers before, but never really thought to try one until recently. Yes, a scalpel – that scary knife used by surgeons that want to cut you open. It was recommended to me in particular when dealing with paper modeling because scalpel blades are thinner than X-Acto type blades.